| Cover | Jan. 26, 2022 |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jan. 26, 2022 |
| Entity File Number | 001-39726 |
| Entity Registrant Name | OMNICHANNEL ACQUISITION CORP. |
| Entity Central Index Key | 0001827669 |
| Entity Tax Identification Number | 85-3113789 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 485 Springfield Avenue #8 |
| Entity Address, City or Town | Summit |
| Entity Address, State or Province | NJ |
| Entity Address, Postal Zip Code | 07901 |
| City Area Code | (908) |
| Local Phone Number | 271-6641 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
| Units, each consisting of one share of Class A common stock and one-half of one redeemable warrant | |
| Title of 12(b) Security | Units, each consisting of one share of Class A common stock and one-half of one redeemable warrant |
| Trading Symbol | OCA.U |
| Security Exchange Name | NYSE |
| Class A common stock, par value $0.0001 per share | |
| Title of 12(b) Security | Class A common stock, par value $0.0001 per share |
| Trading Symbol | OCA |
| Security Exchange Name | NYSE |
| Redeemable warrants, each warrant exercisable for one share of Class A common stock, each at an exercise price of $11.50 per share | |
| Title of 12(b) Security | Redeemable warrants, each warrant exercisable for one share of Class A common stock, each at an exercise price of $11.50 per share |
| Trading Symbol | OCA WS |
| Security Exchange Name | NYSE |
